ICD10BillableValid for clinical use
ICD-10 Code A27.9: Leptospirosis, unspecified
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).
When is it used?
- May be used when a clinician documents leptospirosis, unspecified in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
Code hierarchy
chapter
1Certain infectious and parasitic diseases (A00-B99)
block
A20-A28Certain zoonotic bacterial diseases
category
A27Leptospirosis
currentA27
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
Infectious Disease SpecialistGeneral Physician
Mapped diagnoses and classifications
SNOMED_CT 406589003high
Leptospira infection of the central nervous system
Source: SNOMED International ICD-10 map
SNOMED_CT 77377001high
Leptospirosis
Source: SNOMED International ICD-10 map
SNOMED_CT 80194003high
Leptospirosis immune phase
Source: SNOMED International ICD-10 map
SNOMED_CT 79309005high
Leptospirosis leptospiremic phase
Source: SNOMED International ICD-10 map
SNOMED_CT 871842007high
Intracranial hemorrhage due to leptospirosis
Source: SNOMED International ICD-10 map
SNOMED_CT 16038004high
Miscarriage due to Leptospira
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
A27.9
Common synonyms
Leptospirosis, unspecifiedLeptospirosis
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.